Free Chromosomes MCQs with Answers
633 Chromosomes MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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633 questions · page 14 of 32
- A. Single ; two
- B. Single ; three
- C. Triplet ; two
- D. Triplet ; three
Explanation: The genetic code has a triplet base. Nonsense codons are those that terminate the translation process since there are no corresponding…
Correct answer: Triplet ; three- A. RNA polymerase
- B. Helicase
- C. Elongation factor
- D. Primase
Explanation: mRNAs are usually translated by a series of ribosomes, spaced at intervals of about 100 to 200 nucleotides.Elongation factors are a group…
Correct answer: Elongation factor263. Locus is defined as:
- A. Position of a gene on the chromosome.
- B. Appearance of a trait in an individual
- C. Partner of a gene pair
- D. Gene in an individual for a trait
Explanation: A locus is the specific physical location of a gene or other DNA In genetics, a locus (plural: loci) refers to the specific position or…
Correct answer: Position of a gene on the chromosome.- A. Hereditary
- B. Secretory
- C. Power house
- D. Food synthesis
- E. Protein formation
Explanation: Chromosomes are thread-like structures made up of DNA and proteins, and are present in the nucleus of eukaryotic cells.
Correct answer: Hereditary- A. Epistasis
- B. Gene linkage
- C. Crossing over
- D. Pleiotropy
- E. Bombay Phenotype
Explanation: Gene linkage is a physical relationship of genes present on the same chromosome, which results in the tendency of the genes to be…
Correct answer: Gene linkage- A. Non-fusion
- B. Non-disjunction
- C. Fusion
- D. Interference
Explanation: Non-disjunction: It is the failure of the chromosomes to separate, which produces daughter cells of an abnormal number of chromosomes.
Correct answer: Non-disjunction- A. Nucleus
- B. Nucleolus
- C. Cytoplasm
- D. Ribosomes
Explanation: Translation is the process of protein synthesis in which the ribosomes read the messenger RNA (mRNA) and use the information to synthesize…
Correct answer: Ribosomes- A. Release factors
- B. Methionine
- C. tRNA
- D. Amino acids
Explanation: Stop codons are sequences of nucleotides in the mRNA that signal the end of the protein-coding sequence.
Correct answer: Release factors- A. TAG
- B. AUG
- C. UAG
- D. AAA
- E. AGT
Explanation: UAG is one of the three stop codons, also known as termination codons, in the genetic code. The other two stop codons are UAA and UGA.
Correct answer: UAG- A. Down
- B. Turner
- C. Klinefelter
- D. None of the above
Explanation: Turner syndrome is often not recognized until adolescence. Down syndrome and Klinefelter syndrome are typically recognized at birth.
Correct answer: Turner- A. 4
- B. 10
- C. 24
- D. 23
Explanation: Humans contain 46 chromosomes in their cells, this number is diploid. The haploid number is half of the diploid number which is 23.
Correct answer: 23- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: A deletion, as related to genomics, is a type of mutation that involves the loss of one or more nucleotides from a segment of DNA An…
Correct answer: Option C273. In sexual reproduction, sex cells contain _ chromosomes when compared to other cells of the body
- A. same
- B. half
- C. double
- D. all of the above
Explanation: The sex cells are formed as a result of meiosis(reduction division) which causes the original normal chromosome number of the cell (2n) to…
Correct answer: half- A. A and B are purines, and C, D, and E are pyrimidines.
- B. D and B are purines, and C, A, and E are pyrimidines
- C. A and E are purines, and C, D, and B are pyrimidines.
- D. A and C are purines, and B, D, and E are pyrimidines.
Explanation: Purines are those bases that are double-ringed. Pyrimidines have a single ring.
Correct answer: A and C are purines, and B, D, and E are pyrimidines.- A. 200 - 4
- B. 200 - 8
- C. 200 - 16
- D. 200 - 40
Explanation: A strand of 200 nucleotides long are wrapped twice around a core of eight histone proteins to form a structure called a nucleosome.
Correct answer: 200 - 8- A. A
- B. B
- C. C
- D. D
Explanation: This picture has all requirements (tRNA,mRNA, and ribosome) for the protein synthesis (translation) to happen except RNA polymerase, which…
Correct answer: C- A. Restriction enzyme
- B. Reverse transcriptase.
- C. RNA polymerase
- D. DNA polymerase
Explanation: RNA polymerase carries out the function to copy the DNA sequence into an RNA sequence.A restriction enzyme is used to cleave the DNA at…
Correct answer: RNA polymerase- A. UAA-AUG-CAA-CUU-AUU
- B. AUG-CAA-CUU-AUU-UAA
- C. AUU-AUG.CAA.CUU-UAA
- D. AUG-UAA -CUU-AUU.CAA
Explanation: AUG-CAA-CUU-AUU-UAA is most appropriate because it starts with a start codon and ends with a stop codon while having CUU and AUU at third…
Correct answer: AUG-CAA-CUU-AUU-UAA- A. Primary structure is conserved, and secondary structure is disturbed
- B. Secondary structure is conserved, and the primary structure is disrupted
- C. both the primary and secondary structures are conserved
- D. Both the primary and secondary structures are disrupted
Explanation: In semi conservative replication, the original molecule is unzipped; each strand of the duplex becomes a part of another duplex.
Correct answer: Primary structure is conserved, and secondary structure is disturbed- A. Metacentric
- B. Submetacentric
- C. Telocentric
- D. Acrocentric
Explanation: A chromosome where the centromere is not central and is instead located near the end of the chromosome.
Correct answer: Acrocentric